public class Client {
    public static void main(String[] args) {


        ConcreteMediator mediator = new ConcreteMediator();
        Button button = new Button();
        List list = new List();
        Label label = new Label();
        TextBox textBox = new TextBox();
        ComboBox comboBox = new ComboBox();

        mediator.addComponents(button);
        mediator.addComponents(label);
        mediator.addComponents(textBox);
        mediator.addComponents(comboBox);
        mediator.addComponents(list);

        comboBox.changed();
    }
}